The large container is used to create a stable environment. The small containers are used to hold the saturated salt solution. The saturated salt solutions generate well-defined humidities when they are confined to a contained environment.

The RH Calibration Kit includes the following items:

3 Clear, sealable containers

1 Container with magnesium chloride solution

1 Container with sodium chloride solution two wooden scrapers

An insulated carrying case to hold all of the above and maintain a stable environment while performing calibration